NAME
strspn, strcspn - string [complementary] span
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <string.h>
size_t strspn(const char *s, const char *accept); size_t strcspn(const char *s, const char *reject);
DESCRIPTION
- strspn()
-
The strspn() function calculates the length (in bytes) of the initial segment of s which consists entirely of bytes in accept.
- strcspn()
-
The strcspn() function calculates the length of the initial segment of s which consists entirely of bytes not in reject.
-
It is equivalent to
-
(strpbrk(s, reject) ?: strnul(s)) - s
RETURN VALUE
The strspn() function returns the number of bytes in the initial segment of s which consist only of bytes from accept.
The strcspn() function returns the number of bytes in the initial segment of s which are not in the string reject.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| strspn(), strcspn() | Thread safety | MT-Safe |
STANDARDS
C11, POSIX.1-2008.
HISTORY
POSIX.1-2001, C89, SVr4, 4.3BSD.